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From "brian yoder (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-725) Allow JoinTable & JoinColumns to map oneToOne relationship using a join table with multiple columns.
Date Tue, 16 Sep 2008 17:12:44 GMT
Allow JoinTable & JoinColumns to map oneToOne relationship using a join table with multiple
columns.
----------------------------------------------------------------------------------------------------

                 Key: OPENJPA-725
                 URL: https://issues.apache.org/jira/browse/OPENJPA-725
             Project: OpenJPA
          Issue Type: New Feature
            Reporter: brian yoder
            Priority: Minor


When trying to map a oneToOne relationship using a JoinTable it complains:

[9/16/08 9:29:59:932 PDT] 00000029 SystemErr     R <openjpa-1.0.1-r420667:592145 fatal
user error> org.apache.openjpa.persistence.ArgumentException: You have supplied columns
for "com.sscims.im.entity.Ecase.sourceEmail<element:class java.lang.Object>", but this
mapping cannot have columns in this context.

Here is an example from Hibernate of what I am trying to do:

	@OneToOne
    @JoinTable(
            name="ct_email_msg",
            joinColumns={
                @JoinColumn(name="email_entity_type", referencedColumnName="'ecaseEmail'"),
                @JoinColumn(name="email_entity_id", referencedColumnName="ecase_id"),
                @JoinColumn(name="email_type", referencedColumnName="'" + CtEmailMsg.TYPE_RECEIVED
+ "'")
            },
            inverseJoinColumns=@JoinColumn(name="entity_attachment_id", referencedColumnName="entity_attachment_id")
  
        )	
	public CtEmailMsg getSourceEmail() {
		return sourceEmail;
	}


Basically I have a join table (reference table) that has a three column primary key.  But
it has a oneToOne relationship to another object, so I need to be able to join to it from
my parent entity.

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